Lecanoropsis subravida (Nyl.) Ivanovich & Printzen

in Ivanovich & al., Phytotaxa, 695, 1: 47, 2025. Basionym: Lecanora subravida Nyl. - Flora, 55: 250, 1872
Synonyms: Lecanora varia (Hoffm.) Ach. var. subravida (Nyl.) Nyl.
Distribution:
Description: Thallus crustose, fully endosubstratic or with scattered, up to 0.1 mm wide warts, up to 0.8 mm thick, whitish, pale brown or greyish brown to beige, matt, ecorticate, usually forming large patches. Apothecia lecanorine, 0.5-0.85 mm across, sessile and constricted at base, with a persistently flat, beige, ochre to dark brown or black, epruinose or finely white-pruinose disc and a distinct, smooth to finally knobby-crenulate, persistent thalline margin. Thalline exciple 160-190 µm wide, the cortex (16-)18-33(40) µm wide laterally and (33-)56-91(-116) µm wide at base, of anticlinally arranged, conglutinated hyphae, the medullary part filled with granules: proper exciple poorly developed, colourless; epithecium colourless to faintly brown, with an epipsamma of small yellowish granules, N-; hymenium colourless, without granules, (45-)50-60(-70) µm high; paraphyses simple to rarely sparingly branched, 1.5-2 µm thick at mid-level, the apical cells 2-3.5 μm wide, the gel sheath at apices 2.5-5 μm wide; hypothecium colourless, (60-)110-165(-250) µm high. Asci 8-spored, clavate, very thin-walled, with a K/I+ blue, the tholus penetrated by a faintly amyloid apical cushion, the wall K/I-, surrounded by a blue outer layer, Lecanora-type. Ascospores 1-celled, hyaline, broadly ellipsoid, (7-)9.6-10(-10.7) x (3.5-)5-6(-7) µm. Macropycnidia rare, 120-140 µm across, producing falcate macroconidia measuring 9-10 x 3.5-4 µm; micropycnidia very rare, 50-70 µm across, producing curved microconidia measuring 7-8 x c. 0.8 µm; leptopycnidia abundant, globose, c. 90 µm across, producing thread-like, curved leptoconidia measuring 10.8-11 x 0.7-0.9 µm. Photobiont chlorococcoid. Spot tests: K+ faintly yellow or K-, C-, KC+ faintly yellow, P-. Chemistry: usnic or isousnic acid, ±pseudoplacodiolic (trace) and squamatic acid (found in a single specimen).
Note: on wood, or on the bark of old trunks of conifers, with several scattered, mostly ancient records in the Alps, all outside Italian territory; to be looked for in the Italian Alps. For further details see van den Boom & Brand (2008), Svensson & al. (2024), and Ivanovich & al. (2025).
Growth form: Crustose
Substrata: bark and lignum
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual

pH of the substrata:

12345

(info)

Solar irradiation:

12345

(info)

Aridity:

12345

(info)

Eutrophication:

12345

(info)

Poleotolerance:

0123

(info)

Altitudinal distribution:

123456

(info)


Predictive model

Source: https://s3.msi.umn.edu/mbaenrms3fs/images/MIN_Lichens/01380/1380875_lg.jpg
Bell Museum of Natural History, University of Minnesota - Lichens (MIN:Lichens) Catalog #: 21961 Occurrence ID: 36d0fc0e-b2a6-477f-b833-a05efc72a39e Secondary Catalog #: 1357359 Taxon: Lecanora subravida Nyl. Family: Lecanoraceae Collector: Arnold; Date: 1888-00-00 Verbatim Date: 1888 Locality: Germany, Bavaria, Notes: filed at MIN under 'Arnold - Lichenes Exsiccati'\r Public Domain


Source: https://s3.msi.umn.edu/mbaenrms3fs/images/MIN_Lichens/01380/1380875_lg.jpg
Bell Museum of Natural History, University of Minnesota - Lichens (MIN:Lichens) Catalog #: 21961 Occurrence ID: 36d0fc0e-b2a6-477f-b833-a05efc72a39e Secondary Catalog #: 1357359 Taxon: Lecanora subravida Nyl. Family: Lecanoraceae Collector: Arnold; Date: 1888-00-00 Verbatim Date: 1888 Locality: Germany, Bavaria, Notes: filed at MIN under 'Arnold - Lichenes Exsiccati'\r Public Domain